Haskell is much more interesting as a language than Java. And Haskell has its supporters within the HN community who are willing to inform those unfamiliar with the language.
Java is a supremely boring language, and was when it started. It is a pure industry project, it will eventually go the way of COBOL; although interfacing with it from other languages will become more common.<p>The most interesting part of java, was the JVM, which has been subject to plenty of attention.
I think it's a few different reasons:<p>- There is a lot about Java elsewhere<p>- Java isn't so interesting and is probably used at a lot of HNers for work.<p>- Java doesn't represent the future of programming to many, though it's advances in tandem with keeping backwards compatibility are respectable.